In a new clip from Sunday's Revenge (which was actually seen in part during one of the earlier Revenge sneak peeks from "Union"), we see Emily and Nolan talking on the eve of Jack's nuptials.

As Nolan is well aware, Jack marrying her doppelganger/alter ego makes for mixed emotions, though Ems insists she's happy for the two of them, because they deserve things to go their way.

That's when Nolan reveals a key detail about Jack's life that Emily wasn't aware of, and which may change her opinion on a lot of things, as well as influence the next move in her Revengenda.

How will this complex and multi-layered storyline play out on Sunday's episode and the following week's installment, "Sacrifice"? ABC's extended Revenge trailer is intriguing to say the least.

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Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.